raphe: The line or ridge which runs from the hilum to the chalaza.
"Manual of American Grape-Growing"
U. P. Hedrick
Seeds small, not notched; beak short, blunt; raphe distinct to indistinct, usually showing as a narrow groove; chalaza pear-shaped, sometimes distinct, but usually a depression only.
"Manual of American Grape-Growing"
U. P. Hedrick
Seeds two to three, of medium size, plump, smooth, not notched; chalaza oval, distinct; raphe a distinct cord-like ridge.
"Manual of American Grape-Growing"
U. P. Hedrick